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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Product Warranty Reserves
The following table summarizes the changes in total product warranty and legacy product warranty liability reserves for the periods presented:


Product Warranty

Legacy Product Warranty

Total
Millions of dollars

2018

2017

2018

2017

2018

2017
Balance at January 1

$
277


$
251


$
—


$
69


$
277


$
320

Issuances/accruals during the period

85


87


—


—


85


87

Settlements made during the period/other

(83
)

(89
)

—


(26
)

(83
)

(115
)
Balance at March 31

$
279


$
249


$
—


$
43


$
279


$
292




















Current portion

$
202


$
184


$
—


$
43


$
202


$
227

Non-current portion

77


65


—


—


77


65

Total

$
279


$
249


$
—


$
43


$
279


$
292